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采用尿素辅助的共沉淀模板法,通过在单分散的SiO2微球模板上包覆Lu(OH)3制备出了具有核-壳结构的SiO2@Lu(OH)3粉体颗粒,经煅烧后得到了LSO:Ce3+荧光粉体.结果发现煅烧温度对荧光粉的相组成和形貌都产生了很大影响.当在1200℃下煅烧2 h时,得到了单相LSO:Ce3+粉体.在900℃煅烧后的粉体颗粒呈球形,粒径大约为400～500 nm,随着煅烧温度的升高,粉体形状变得不规则,而且有团聚现象.采用PL光谱仪对1200℃煅烧的粉体进行了光学性能表征,结果表明其激发谱中的最强激发峰位于360 nm处,发射谱表现为位于384～440 nm范围内宽发射峰中心420 nm,归因为Ce3+的5d→4f间的电子跃迁.
The SiO2 @ Lu (OH) 3 powder with the core-shell structure was prepared by co-precipitation template method with urea-assisted coating by coating Lu (OH) 3 onto the monodisperse SiO2 microsphere template. The LSO: Ce3 + phosphor was used to investigate the effect of calcination temperature on the phase composition and morphology of the phosphor. When calcined at 1200 ℃ for 2 h, single phase LSO: Ce3 + ℃ after calcined powder particles are spherical, the particle size is about 400 ~ 500 nm, with the calcination temperature increases, the powder becomes irregular shape, and the phenomenon of agglomeration.Using PL spectrometer 1200 ℃ calcined powder The results show that the strongest excitation peak in the excitation spectrum is at 360 nm and the emission spectrum is at 420 nm centered at the broad emission peak in the range of 384-440 nm. The emission spectrum is attributed to the electron between 5d → 4f of Ce3 + Jump